英文:
Set context to request when the later is initialised with a url.URL
问题
我想创建一个 net/url.URL，然后在 http.Client 和 http.Request 结构中使用它，如下所示：
client := http.Client{
Timeout: 5 * time.Second,
}
req := http.Request{
URL: someKindOf_url.URL_type_I_have_already_initialised_elsewhere,
}
resp, err := client.Do(&req)
在构建 req 时，我想传递一个（已经存在的）context.Context。
Request 类型 似乎没有这样的字段。
有这个 NewRequestWithContext 工厂 函数，但它使用一个字符串而不是 net/url.URL。
有没有办法解决这个问题？
英文:
I want to create a net/url.URL and then use it in http.Client and http.Request constructs as follows
client := http.Client{
Timeout: 5 * time.Second,
}
req := http.Request{
URL: someKindOf_url.URL_type_I_have_already_initialised_elsewhere,
}
resp, err := client.Do(&req)
Upon req construction, I want to pass an (already existing) context.Context
The Request type does not seem to have such a field.
There is this NewRequestWithContext factory function, but uses a string for the URL and not a net/url.URL
Is there a way around this?
答案1
得分: 3
你永远不应该使用字面值创建一个http.Request对象。应该始终使用构造函数NewRequest或NewRequestWithContext。构造函数做了很多事情，不仅仅是将简单的值分配给一个结构体。
考虑到这一点，实现你的目标的正确方式是，例如：
req := http.NewRequestWithContext(ctx, http.MethodGet, someKindOf_url.String(), nil)
也可以将上下文分配给现有的请求：
req = req.WithContext(ctx)
英文:
You should never create an http.Request object with a literal. Always use the constructor functions NewRequest or NewRequestWithContext. The constructor does a lot more than simply assigning simple values to a struct.
With this in mind, the correct way to achieve your goal would be, for example:
req := http.NewRequestWithContext(ctx, http.MethodGet, someKindOf_url.String(), nil)
That said, you can assign a context to an existing request:
req = req.WithContext(ctx)
答案2
得分: 0
http.Request没有公共的context字段，但是有一个私有的context字段。
你可以使用http.Request的WithContext(ctx context.Context)方法来实现。
英文:
http.Request doen't have a public context field, but have it private.
What you can do is use WithContext(ctx context.Context) method of http.Request
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